Process of production and simultaneous conversion of articles obtained from solutions into the ultimate forms



B. BORZYKOWSKI.v

PROCESS or mouucnou AND SIMULTANEOUS CONVERSION or ARTICLES OBTAINED FROM soumous INTO THE ULTIMATE Foams.

APPLICATION FILED JUNE 19,1520- 1,375,824, Patented m. 26, 1921 v gwucnl'ozi Henna zowzylowslzj Maw UNITED STATES PATENT OFFICE.

BENNO BORZYKOWSKI, 0F PARIS, FRANCE.

PROCESS 013 PRODUCTION AND SIMULTANEOUS CONVERSION OF ARTICLES OBTAINED FROM SOLUTIONS INTO THE ULTIMATE FQRHS.

Specification of Letters Patent.

Patented Apr. 26, 1921.

Original application filedlmiay 29, 1917, Serial No. 17;,794. Divided and this application filed June 19, 1920. Serial No. 390,240.

5 and useful Processes of Production and Simultaneous Conversion of Articles Obtained from Solutions into the Ultimate Forms, of which the following is a specification.

This invention relates to a process for the production of articles such as threads, films, etc, from the original material, e. 9., cellulose, and for the simultaneous conversion of the same into the final product, 6. 9., cellulose hydrate articles.

In the manufacture of artificial articles from cellulose solutions, more particularly in the production of artificial silk from cupric oXid-ammonia-cellulose solutions and from viscose, it is known in this art that for the former the alkaline coagulation (caustic alkaline) and for the latter salt baths yield better results in the final product than when acids are used as precipitating ,baths.

The method heretofore practised for employing these precipitants is, however, troublesome and impractical, for the reason that a series of manipulations must be executed in order to reprecipitate the'articles passing out of the spinning baths and wound up on rollers and the like, or to convert them into the final product, cellulose hydrate. For instance, when the process is carried out as set forth in U. S. patent to Stearn No. 622,087 the viscose articles precipitated in ammonium salts must be treated, in order to complete the conversion (coagulation) of the same to the innermost core for from 6 to 12 hours ina cold and then in a bollmg ammonium chlorid bath, and the ammonium chlorid removed by boiling with water, washing, etc., before the articles can be transformed into cellulose hydrate and bleached by means ofdilute acid.

Ihave found that it is very advantageous and practical to use alkaline";or neutral setting baths, and that all the disadvantages mentioned can be obviated by combining an alkaline or neutral and an acid setting bath; that is, using them successively in a. continuous operation. The process and one form of apparatus by which the process may be efi'ected will be ex lained with the aid of I the accompanying. iagrammatic drawing;

temperature, and gives the article (threads or the like) the character which is desired,

or at least suitable for winding the article on the roller C. The trough D contains the agent suitable for the conversion of the cellulose article into cellulose hydrate, e. 9.,

sulfuric acid, which runs through the perforated bottom of the trough onto the article wound up on the roller. The lower collecting trough E receives the acid which flows oil and which is passed through a pipe F into a receptacle G, from which it is conveyed, after having been stren thened and purified, by means of a pump to the trough D to be used anew. if necessary, the acid may also be allowed to collect in the trough E up to the overflow pipe I and made to act on the wound-up material. It is more practical, however, to immediately carry off the acid dripping from the roller C and to allow only fresh or regenerated and purified acid to run onto the article in order not to convey back to the latter the salts and impurities separated out.

By this process and apparatus the method of precipitation by means of alkal1ne or neutral baths is greatly improved and sunplified. The object of the alkalineor neutral precipitation is attained, wh1ch consists chiefly in the fact that the articles, more particularlythreads, can be strongly stretched, thereby imparting to them higher luster and greater suppleness, and this is not yery well possible when precipitating inacids or in strong acidified baths, because in that case the article is at once strongly hydrated and therefore in its weakest state, in WhlClilt is very sensitiveito every mechanical action. After having been wound up on rollers or the like, the articles are not subjected to any If, or the like,

apparatus the following improvement 'is'secured: It iswell knownfand is also apparent from U. S'Patent No. 622,087 (German Patent No, 108,511) that cellulose articles, such as viscose threads, which are preclpitated in common salt, alcohol, etc, re-

main for some time in a sticlry condition. When such. threads are wound up in many superposed layers until the spool, roller or the like is full, and are then to be subjected to, further treatment, as described in the above-mentioned patents, the different threads or parts of the same in the meantime stick to the layers of the previously wound threads, so that subsequent unwinding of the threads is either not possible at all or only with considerable loss. With the present process and apparatus, however, this disadvantage'is precluded because each layer oi the article as it winds up is at once brought into contact with the hydrating agent (6. 9., acid) and remains in continuous contact with it until the full roller, etc., is replaced. by an empty one.

After removal of the roller, the articles, which are no longer soluble in water nor sticky, maybe subjected to washing, drying andvother operations.

4 J The apparatus, which is here shown diagrammatically is intended merely for the purpose of illustration and may, of course, be constructed and modified in any manner without thereby affecting the true character of the invention. Nor is this process intended to be confined to articles obtained from the viscose and cupric oxid-ammoniacellulose solutions which are here mentioned by way of example. The process relates, on the contrary, to every kind of solution and intense tor instance, nitrocellulose solutions may be.

lutions may be precipitated in an ammoni um sulfate bath or the like, and the property of water resistance, which the final product must possess, may be imparted by a continuing treatment with formaldehyde or the like.

This application is a division of my applic;.tion Serial No. 171,79d, filed May 29th, 191

What'is claimed'is,-

-l. That process of producing articles from coagulable solutions, which consists in passing the same directly into an alkaline bath and immediately thereafter, as a continuing operation, subjecting the same to an ultimate chemical conversion.

2. That process of producing articles from coagulable solutions, which consists in pass ing the same directly into an alkaline bath, and immediately thereafter subjecting the material to acid treatment.

3. That process of producing articles from coagulable solutions, which consists in pass ing the material through an alkaline bath, thereafter winding the same under tension, and subjecting it while being wound to acid treatment.

I 4:. That process of treating cellulose masses, which consists in spinning the same into an alkaline bath, withdrawing the thread from the bath and winding the same under tension, and simultaneously converting the same into cellulose hydrate by sub-.

BENNO BORZYKOWSKI. 

